Which of the following is NOT a component of DNA?

a. thymine
b. phosphate
c. adenine
d. ribose
e. guanine


ANSWER: d

Biology & Microbiology

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Encapsulated yeast is identified in the cerebrospinal fluid (CSF) of a patient with AIDS. The most likely stain or reagent used to identify this organism is:

a. potassium hydroxide (KOH). b. calcofluor white. c. lactophenol cotton blue. d. India ink.

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Which of the following traits is not characteristic of amphibians?

a. carnivorous as adults b. four-chambered heart c. needing water to breed d. evolved from lobe-finned fish

Biology & Microbiology

Why are toxins more concentrated in sediments than in the overlying water column?

What will be an ideal response?

Biology & Microbiology

The mechanism that causes a vine’s tendrils to grow around an object, such as a wire fenceline, is called ____

a. thigmotropism b. phototropism c. gravitropism d. vernalization e. photoperiodism

Biology & Microbiology